Software

GalliumOS includes GalliumOS Update in the Launcher menu. It is a simple wrapper around apt to update installed packages. You will be notified automatically when new software is available.

Does Minecraft work? Does Steam work?

Yes and yes. Remember that in most cases, this is not powerful hardware. Minecraft is playable at 30fps on an Acer C720 (2GB Celeron 2955U 1.4GHz), and many Steam titles are playable on the same hardware. A faster processor and additional RAM will improve the experience, as usual.